Circulating cell for fire boxes



Oct. 26 1926.

C. H. MILLER CIRCULATING CELL FOR FIRE BOXES Filed April 17. 1925 nan-OO B060 O 0 00 O DQQO O 0950 O 600 O 000 0 D00 0 G90 0 fig-.5

"7 k /VI Patented Oct. 26, 1926. i

FATENT CHARLES H. MILLER, OF MELWIPHIS, TENNESSEE, ASSIGNOR OF ONE-HALFTO JOSEPH HATTENDORF, OF IVIEMPHIS, TENNESSEE.

CIRCULATING CELL FOR FIRE BOXES.

Application filed. April 17, 1925.

In boilers of locomotive type in which the fire boxes are flanked on thesides by what is known as water legs, there is a lack of circulation inthe lower portion of these legs which decreases very considerably thevalue of the heating surface adjacent to the hottest part of the fireand thereby makes necessary an increase in heating surface area in orderto compensate for this reduction.

The objects of my invention are primarily, to provide means whereby thecirculation of the water in these water legs will be improved, and

secondarily, to provide an improved circulating cell for this purpose.

I accomplish these objects as will be more fully hereinafter set out inthe drawings, specification and claims.

In the drawings:

Fig. 1 is a half end elevation and half section of the fire box end of alocomotive type boiler.

Fig. 2 is a cross section on an enlarged box side sheet which are spacedapart to form the water leg. 3 indicates stay bolts, the center linesonly being shown in this new stay bolts 6, also indicated only.

My improved circulating cell is a tube 7, the fire side of which ispreferably seinicircular in cross section with a flattened side 8adjacent the fire box side sheet 2, the tube being preferably ofconstant width but of increasing depth from the lower to the upper end.This tube has an opening 9 near the lower end and an opening 10 near theupper end thereof and is longitudinally shaped to conform to thecurvature ofthe sheets to which it is to be attached. The lower end ofthe tube is secured as near the bottom of the water leg as is feasibleand the upper end is secured to the fire box crown sheet slightly to oneside of the center line of the leaner.

41 is the outer crown sheet and 5 the fire box crown sheet, similarlyconnected by Serial No. 23,791.

The tube 7 as shown in cross section in Fig. 2 is rolled from a plate insuch manner that there will be an arcuate or partly circular section 11,and in the deeper portions parallel sections 12 integral therewith,having outwardly turned flanges 13 extending therefrom, thus forming adeep channel, the open side of which thus is closed by a flat plate 8which is secured thereto by welding along lines 15 and 16, thus forminga tube with one flat side and outwardly extending flanges. By varyingthe width of theparallel sections 12 the depth of the tube may beincreased or decreased as the case may be,

giving the variation in depth shown in the section Fig. 1.

Adjacent the upper and lower ends of this tube, the plate 8 is cut awayto give the open ings 10 and 9 before mentioned. Also in forming thetube it is as before noted, so curved longitudinally that the flanges 13and the plate 8 are exactly conformed to the inner contour or fire sideof the sheets 2 and 5. These sheets are cut away where the tube 7 is tobe placed for a space embracing three lines of stay bolts as moreclearly shown in Fig. 2, where 3*, 3 and 3 indicate stay bolts. The tube7 is placed against the sheets 2 and 5 on the fire side thereof over theopening so cut and the outer edges of the flanges 13 are welded to thissheet. These flanges only overlap the edges of the sheets 2 and 5, adjacent this opening, suificiently to permit a perfect. .weld, the purposebeing as far as possible to present as little sheet of double thicknessto the flames as possible. When the tube has been so welded, the centerrow of stay bolts 3 is connected into the plate 8, with the exception ofone stay bolt near the upper end and one stay bolt near the lower end inline with the openings 10 and 9 respectively which are ntended throughthese openings into the arcuate section 11 of the tube. The outer rowsof rivets 3 and 3 are extended through and secured to the flanges 13thus throwing the entire strain on the stay bolts rather than on thewelds.

In Fig. 3 the location of three of these tubes 7 is indicated in dottedlines, there being in this case three of the tubes on each side of theboiler. If it be desired additional tubes 7 may be placed at the end ofthe boiler on each side of the fire door 17, as shown in Fig. 1.

in 2 the stay i-iolt is shown in tion with a center hole therein. Thistype of centrally drilled stay bolts is preferably the one used inattaching these tubes, the purpose being to function not only as theordinary tell-tale but also to provide aguiding means so that in case ofa broken stay bolt a drill may be centered by this hole and the brokenend of the bolt drilled out without damage to the sheets.

The action of the device is as follows Naterin the tube is heated to agreater extent by its proximity to the flames than is the water in thewater leg of the boiler, it therefore is caused to circulate upward inthese tubes. the additional spacev provided by the enlargement of thecross section from bottom to top assisting this action, and acirculation of the water is thereby set up which causes the same totravel downward in the water leg to replace that moving upward throughthe tube thereby greatly increasing the e'lfioiency of that portion ofthe boiler.

Having now fully described my invention, what I claim and desire tosecure by Letters Patent in the United States, is

1.. In a boiler having fire box, a water leg on each side, and a crownsheet over said fire box, a tubular cell within said fire box, havingone of its sides shaped to conform to the inner surface thereof, andextending from the lower portion of a water leg upward to the crownsheet, and communicating with an opening therein and with said Waterleg, whereby water circulation is induced in the water leg, said cellbeing secured to the water leg substantially throughout the length ofthe cell. r

2. In a boiler having a fire box, a water leg on each side, and a crownsheet over said fire box, a tubular cell within said fire box, extendingupward from the lower portion of a water leg to the crown sheet, saidcell gradually increasing in diameter in one direction from bottom totop, while retaining the same diameter in another direction, said cellbeing secured to the water leg substan-,

tially throughout the length of the cell.

3. In a boiler having a fire box, a water leg on each side, and a crownsheet over said fire box, a tubular cell within said fire box, extendingupward from the lower portion of a water leg, along, and throughout itslength secured to, said water leg and said crown sheet, andcommunicating with an opening in said crown sheet.

4. In a boiler having a fire box, a water leg on each side, and a crownsheet over said fire box, a tubular cell within said fire box, extendingupward from the lower portion of a water leg, along, and throughout itslength secured to, said water leg and said crown sheet, andcommunicating with openings in said crown sheet and said water leg,respectively.

5. In a boiler having a fire box, a water leg on each side, and a crownsheet over said fire box, a tubular cell within said fire box, flangedthroughout its length, extending upward from the lower portion of awater leg, along said water leg and said crown sheet, said flanges beingwelded to the fire sheet of said water leg and to said crown sheet, andsaid sheets being cut away at predetcru'iined points between said welds.

6. In a boiler having a fire box, a water leg formed by an outer andinner sheet, an outer crown sheet, an inner crown sheet over the firebox, and stay bolts connecting said outer and inner sheets, a tubularcell within said fire box, flanged throughout its length. extendingupward from-the lower portion of said water leg along said inner sheetsand to said crown sheet, 'said inner sheets being cut away atpredetermined points along said cell for a greater width than three rowsof stay bolts, said flanges being welded to said sheets adjacent theopenings thus formed, and said stay bolts being secured into said cellflanges and wall.

7. A boiler having a fire box, a water leg at each side thereof, andacrown sheet thereover, in combination with a water-circulating membercomprising a metal tube of partially arcuate cross-sectionalconfiguration flattened at one side to form a substantially planeexterior surface, said tube having its respective ends secured to awater leg and to said crown sheet, and being secured throughout itslength to said parts, and said tube communicating with said boiler at aplurality of different points.

8. A. boiler having a fire box, a water leg at each side thereof, and acrown sheet thereover, in combination with a water-circulating membercomprising a metal tube having an arcuate surface at one side, a planesurface at another side, and substantially plane surfaces connectingsaid plane surfaces and said arcuate surface, said first-named planesurface being shaped to conform to the inner surface of said fire boxand being secured thereto, and said tube communicating with said boilerat a plurality of different points.

9. A boiler having a fire box, a water leg at each side thereof, and acrown sheet there-- over, in combination with a water-circulating membercomprising a metal tube having an arcuate surface at one side, a planesurface at another side, and substantially plane surfaces connectingsaid plane surface and said arcuate surface, said substantially planesurfaces being provided with flanges shaped to conform to the innersurface of said fire box and being secured thereto throughout theirlength, and said tube comn'iunicating with said boiler at a plurality ofdifferent points.

10. A boiler having a fire box, a water leg at each side thereof, and acrown sheet therellt) over, in combination with a water-circulatingmember communicating with said boiler at a plurality of diflerentpoints, and comprising a metal tube having an arcuate surface at oneside, a plane surface at another side, and substantially plane surfacesconmeeting said plane surface and said arcuate surface, and varying inwidth from one end of said tube to the other, whereby the crosssectionalarea of said tube increases from its lower to its upper end.

11. A boiler having a fire box, a water leg at each side thereof, and acrown sheet thereover, in combination with a water-circulating membercomprising a tube having an arcuate surface at one side, a plane surfaceat another side, conforming to the inner surface of said fire box andsecured thereto substantially throughout the length of said tube, andopenings in said plane side C0111- municating with openings into a waterleg and in said crown sheet, respectively.

12. A boiler having a fire box, a water leg formed by an outer and aninner sheet, an outer crown sheet, an inner crown sheet, and stay boltsconnecting adjacent ones of said inner and outer sheets, in combinationwith a water-circulating element comprising a tube of irregularcross-section, communicating with said boiler at a plurality ofdifferent points, and shaped to conform to the inner surface of saidfire box, and a stay bolt connecting one of said outer sheets with theside of the body wall of said tube which is farthest from said sheet.

In testimony whereof I have hereunto set my name.

CHARLES H. MILLER.

